(CNN) -- A California police department is doing some soul searching after arresting one of its own on allegations of sexually assaulting half a dozen women.

While in uniform, a West Sacramento police officer assaulted at least six women since October 2011, police said Monday. The officer was fired, arrested and investigators are looking for other potential victims.

"I am just appalled and sickened that someone that was put in the position of trust would violate that trust in such an egregious manner," said Dan Drummond, chief of the West Sacramento Police Department. "The whole department is appalled."